This was a very popular question among the candidates. Those who answered the question performed well. Such candidates properly listed the conditions that favour the formation of a delta such as:
- active vertical and lateral erosion at the upper and middle courses of the river;
- sediments formed from the upper and middle courses are deposited at the mouth of the river;
- presence of sheltered, tide-less coast to prevent disappearance of sediments into deep waters;
- there should be no large lakes in the river course to trap the sediments;
- there should be no strong current at the river mouth to wash away the sediments.
The types of delta include:
- arcuate;
- bird’s foot;
- estuarine;
- cuspate. |